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Condensed Consolidated Statements Of Cash Flows - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Cash flows - operating activities:    
Net income including noncontrolling interests $ 109,398 $ 89,709
Depreciation and amortization 20,354 19,265
Amortization of identifiable intangible assets 24,257 20,011
Provision for doubtful accounts 2,543 4,478
Deferred income taxes (6,410) 1,734
Excess tax benefits from share-based compensation (1,554) (1,818)
Equity income from unconsolidated entities (758) (160)
Other non-cash items 2,208 5,565
Distributions from unconsolidated entities 1,829 863
Changes in operating assets and liabilities, excluding the effect of businesses acquired (48,978) (91,862)
Net cash provided by operating activities 102,889 47,785
Cash flows - investing activities:    
Payments for acquisitions of businesses, net of cash acquired (82,724) (232,283)
Proceeds from sale of property, plant and equipment 1,629 909
Purchase of property, plant and equipment (17,668) (18,950)
Net cash used in investing activities (98,763) (250,324)
Cash flows - financing activities:    
Proceeds from revolving credit facility 0 220,000
Repayments of long-term debt (7,601) (8,756)
Repayments of capital lease obligations (716) (816)
Dividends paid to stockholders (9,531) (9,734)
Repurchase of common stock (65,775) (34,074)
Proceeds from exercise of stock options 0 144
Payments to satisfy minimum tax withholding (2,637) (4,111)
Issuance of common stock under employee stock purchase plan 2,191 2,383
Payments for contingent consideration arrangements (1,017) 0
Distributions to noncontrolling interests 0 (2,050)
Net cash (used in) provided by financing activities (85,086) 162,986
Effect of exchange rate changes on cash and cash equivalents 1,739 (4,259)
Decrease in cash and cash equivalents (79,221) (43,812)
Cash and cash equivalents at beginning of year 464,617 486,831
Cash and cash equivalents at end of period 385,396 443,019
Cash paid for:    
Interest 5,600 4,662
Income taxes 67,652 69,555
Non-cash financing activities:    
Assets acquired under capital lease obligations $ 688 $ 1,402